Coal-feeding mechanism for automatic stokers



Sept. 1, 1925. R s RILEY ET AL l 1,552,083

COAL FEEDING MECHANISM FOR AUTOMA'IICI STOKERS Filed Feb. 19, 19214A IBY i ,-MJ Y WAHM/VEN 4INVENTOR Patented Sept. l1, 1925.

UNITED STATES j PATENT oFElcE.

ROBERT SANFORD RILEY AND IRVING A.

ASSIGNORS TO SANFORD RILEY STOKER COMPANY, OF WORCESTER, SETTS, ACORPORATION OEMASSACHUSETTS.

TAYLOR, T WORCESTER, MASSACHUSETTS,

MASSACHU- CoAL-FEEDTNG MECHANISM ron AUTOMATIC sToxEBs.

Application tiled February To all whom t may concern.' A

Be it known that we, ROBERT SANFORD RILEY and IRvING A. TAYLOR, citizensof the United States, both residing at Worcester,

in the county of Worcester and State of Massachusetts, have invented anew and useful Coal-Feeding Mechanism for Automatic Stokers, of whichthe following is a specication. l

This invention'relates to the coal feeding "mechanism of an automaticstoker and particularly to certain features of construction by which theexpense occasioned by wear and corrosion of the` parts may be materiallyy reduced.

In -the usual automatic Stoker, particularly of the underfeed type, thecoal is fed from the bottom of a magazine or hopper by means ofI aslowly reciprocating ram or I piston. The sliding movement of the pistonover the bottom of the hopper causes relatively rapid wear of the parts.The sharp particles of coal caught under the piston scrape and cutthe'metal surfaces which are then easily corroded by the dilute acidsalways found in moist coal and which are forced out of the co'al duringthe feeding operation by the pressure of theA piston thereon. It is oneobject of our invention to provide aA construction in which the wornj'parts may be easily and cheaply replaced.

Another object is to provide a #convenient and. efficient constructionfor retainin a piston packing ring in position in the cy inder whichsupports and guides thel piston. In one `form of our invention we alsoprovide a removable lining sleeve for the cylinder as well as a liningplate for the bottom of the hopper.

Our invention further relates to arrange- 'ments and combinations ofparts'which will be hereinafter described and more articularly pointedout in the appended c aims. '45 Two forms of our invention are shown inthe drawings in which Fi 1 is a vertical sectional 'view of a coalhopperA and cylinder showing one form of our invention; v

'5 Fig. 2 is a similar view showing a modification thereof;

Fig. 3 is a partial sectional elevation taken along the line Figs. 1 or2; and

19, 1921.- Serial No. 446,285.

Fig. 4 is a transverse sectional .elevation taken along the line 4--4 inFig. 1. 55

Referring to the drawings, we have shown a portion of a coal hopper 10and a cylinder 11 connected thereto or forming a projection therefrom. Apiston 12 is mounted to slide in the cylinder 11 and may be ac- 60tuated from a crank pin or eccentric 13 with which it isconnected b apiston rod 14.

' The parts thus far descri d are of the usual type and in themselvesform no part of our present invention. 65

The cylinder 11 in Fig. 1, however, is made of somewhat greater internaldiameter than is usual and a lining sleeve 15 and lin-'- ing plate A16are removably mounted in the cylinder and hop erAto support ythe slidingpiston 12. The s eeve 15 and' plate` 16 may conveniently beformed assections of stand- Aard 4size tubes or pipes which are ysuflicientlyaccurate in size for this purpose, particularly in view of the preferreduse of a. packing ring 17 which encircles the piston and is y,positionedbetween the adjacent ends of th sleeve 15 and the plate 16.

This packing ring 17 is referably formed' vas a one-piece split metaring. closely en- 80.

gaging the piston and reventing the coal from working back 1into thecylinder bearing. t 1

The sleeve 15 may be secured in the cylinder in any convenient manner,as by screws 18 at the bottom and a rivet or screw 19 at the top of thecylinder. The plate 16 may be similarly secured by screws 20 and bolts21 eitherof which may be at times omitted.- A screw 22 may also be usedto prevent an- 90 gular displacement of the ring 17 The constructionshown in Fig. 2 is substantially the same as that shown nfFig. 1, withthe exception that the c linder 11a is made of the correct internaloosely :[it the piston 12, so that the lining sleeve 15 ma be omitted.The lining plate 16 is forme as previously described and serves the samepurpose.

It will be noted that the lining plate 16 is out away along/the dottedline a so that the upper portioni thereof is open to com-`municatefreely with the hopper 10 and that only a small portion is ofthe full cylindrical n form. A

A Having thus describedour mventlon. the

diameter to 0x5` 25 curs the piston may be readily replaced at (Ythereon. -When the plate becomes uses and advantages thereof will bereadily apparent. The lining platev 16 covers the bottom portion. of thehopper 10 and receives the wear and corrosion due to "the mechanical andchemical action of the coal an objectionable extent it is easily removedby loosening the screws 2O or bolts 21, and a newlining plate maybesubstituted'therefor at sli ht expense, at the same time renewin t epacking rin 17 if desirable. This orm of our invention is found verysatisfacto as only. a relatively small amount o wear occurs in thecylinder itself, particularly when the packing ring l] is used, as thispreventsthe coal from workin backward into the cylinder. Under certainconditions, however it may be desirable to make use of the additionallining sleeve 15 which permits the entire supporting structure uponIwhich the piston slides to be readily renewedat slight expense.

It is found in practice that the piston wears much less rapidly thanthe'surface upon which it slides,.but if such wear ocsmall expense.

Having hus described our invention, it will be evident that changes andmodifications can be made therein byy those skilled in the art withinthe spirit and scope thereof as setforth in the claims and we do notwish to be otherwise limited to the details herein disclosed but what weclaim is 1. In a Stoker, a coal hopper having a partially cylindricalbottom portion, a

cylindrical coal feeding piston slidable over said cylindrical bottomportion, said hopper having an outwardly extended cylindrical sleeveforming a bearing for said piston, and a separate segmental removablelining plate covering the cylindrical bottom portion of said'hopper andsupporting the inner end of said piston as it is advanced intosaidhoppen 2. In a st oker, a coal hopper havin a partially cylindricalbottom portion, a cy inorn to` drical coal y feeding piston slidableover said cylindrical bottom portion, said hopper. hav-' hopper, saiddrical coal feeding piston slidable over said cylindrical bottomportion,` said hopper having an outwardl extended cylindrical sleeveforming a aring l"for said piston,-

and a separate segmental removable lining plate covering thecylindricall bottom portion of said hopper and supporting the inner' endof said piston as it is advanced into said hopper, said late being cutfrom a section ofy pipe loose' y fitting said piston and being securedto and directly supported by the hopper bottom.

4. In a Stoker, a coal hofpper; a'cylinder communicating with the lowerportion of said hopper, a piston slidable in said cylinder, a removablelining sleeve fork said cylindcr, a removable lining plate for the lowerportion of said hopper, and a packing ring for said pistondisposedbetweenthe adjacent ends of said liiiin sleeveand plate.

5. In a Stoker, a coalIi communicating with the lower portion of saidhopper, a piston slidable in said cylinder, a removable lining plateloosely fitting said piston and covering the bottom of said ,hopper toprotect the same from wear and corrosion, and a packing ring for saidpiston held from axial movement in said cylin- Ider toward said hopperby said'removable lining plate.

In testimony whereof we have hereunto' aflixed our signatures.

. ROBERT SANFORD RILEY.

IRVING A. TAYLOR.

opper, a cylinder 50 for said piston, `and a l

